Remove character limit in WriteText().

- vfprintf can be used directly here, removing the need for the interim
  buffer. This change allows us to remove the artificial character limit.
- Fix bugs with _text. It wasn't actually getting set earlier, and the
  check was wrong.
- Remove asserts that should use real error checks.

TEST=DataLog and VoECallReport (through voe_auto_test), the only users of WriteText().

Review URL: http://webrtc-codereview.appspot.com/323001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1156 4adac7df-926f-26a2-2b94-8c16560cd09d

src/system_wrappers/interface/file_wrapper.h

@@ -22,7 +22,6 @@ class FileWrapper : public InStream, public OutStream
 {
 public:
     enum { kMaxFileNameSize = 1024};
-    enum { kFileMaxTextMessageSize = 1024};
 
     // Factory method. Constructor disabled.
     static FileWrapper* Create();
@@ -52,15 +51,14 @@ public:
 
     // Write text to the opened file. The written text can contain plain text
     // and text with type specifiers in the same way as sprintf works.
-    virtual WebRtc_Word32 WriteText(const WebRtc_Word8* text, ...) = 0;
+    virtual WebRtc_Word32 WriteText(const char* format, ...) = 0;
 
     // Reads len number of bytes from buf to file.
     virtual int Read(void* buf, int len) = 0;
 
-    // Writes len number of bytes to buf from file. Please note that the actual
-    // writing to file may happen some time later. Call flush to force a write
-    // to take affect
-    virtual bool Write(const void *buf,int len) = 0;
+    // Writes len number of bytes to buf from file. The actual writing to file
+    // may happen some time later. Call flush to force a write to take effect.
+    virtual bool Write(const void *buf, int len) = 0;
 
     // Rewinds the file to the start. Only available when OpenFile() has been
     // called with loop argument set to true. Or readOnly argument has been set

src/system_wrappers/source/file_impl.cc

@@ -10,13 +10,13 @@
 
 #include "file_impl.h"
 
-#include <cassert>
+#include <assert.h>
 
 #ifdef _WIN32
-    #include <Windows.h>
+#include <Windows.h>
 #else
-    #include <stdarg.h>
-    #include <string.h>
+#include <stdarg.h>
+#include <string.h>
 #endif
 
 namespace webrtc {
@@ -125,6 +125,7 @@ WebRtc_Word32 FileWrapperImpl::OpenFile(const WebRtc_Word8 *fileNameUTF8,
     }
 
     _readOnly = readOnly;
+    _text = text;
 
     FILE *tmpId = NULL;
 #if defined _WIN32
@@ -174,7 +175,7 @@ WebRtc_Word32 FileWrapperImpl::OpenFile(const WebRtc_Word8 *fileNameUTF8,
 
     if (tmpId != NULL)
     {
-        // + 1 comes fro copying the NULL termination charachter too
+        // +1 comes from copying the NULL termination character.
         memcpy(_fileNameUTF8, fileNameUTF8, length + 1);
         if (_id != NULL)
         {
@@ -196,7 +197,7 @@ int FileWrapperImpl::Read(void *buf, int len)
     }
     if (_id != NULL)
     {
-        WebRtc_Word32 res = static_cast<WebRtc_Word32>(fread(buf, 1, len, _id));
+        int res = static_cast<int>(fread(buf, 1, len, _id));
         if (res != len)
         {
             if(!_looping)
@@ -209,41 +210,43 @@ int FileWrapperImpl::Read(void *buf, int len)
     return -1;
 }
 
-WebRtc_Word32 FileWrapperImpl::WriteText(const WebRtc_Word8* text, ...)
+WebRtc_Word32 FileWrapperImpl::WriteText(const char* format, ...)
 {
-    assert(!_readOnly);
-    assert(!_text);
+    if (_readOnly)
+        return -1;
+
+    if (!_text)
+        return -1;
 
     if (_id == NULL)
+        return -1;
+
+    if (format == NULL)
+        return -1;
+
+    va_list args;
+    va_start(args, format);
+    int num_bytes = vfprintf(_id, format, args);
+    va_end(args);
+
+    if (num_bytes > 0)
     {
+        return 0;
+    }
+    else
+    {
+        CloseFile();
         return -1;
     }
-
-    char tempBuff[kFileMaxTextMessageSize];
-    if (text)
-    {
-        va_list args;
-        va_start(args, text);
-#ifdef _WIN32
-        _vsnprintf(tempBuff, kFileMaxTextMessageSize-1, text, args);
-#else
-        vsnprintf(tempBuff, kFileMaxTextMessageSize-1, text, args);
-#endif
-        va_end(args);
-        WebRtc_Word32 nBytes;
-        nBytes = fprintf(_id, "%s", tempBuff);
-        if (nBytes > 0)
-        {
-            return 0;
-        }
-        CloseFile();
-    }
-    return -1;
 }
 
 bool FileWrapperImpl::Write(const void* buf, int len)
 {
-    assert(!_readOnly);
+    if (!_readOnly)
+    {
+        return false;
+    }
+
     if (_id != NULL)
     {
         // Check if it's time to stop writing.

src/system_wrappers/source/file_impl.h

@@ -40,7 +40,7 @@ public:
     virtual bool Write(const void *buf, int len);
     virtual int Rewind();
 
-    virtual WebRtc_Word32 WriteText(const WebRtc_Word8* text, ...);
+    virtual WebRtc_Word32 WriteText(const char* format, ...);
 
 private:
     FILE*          _id;